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From Michael Kjellman <>
Subject Re: Why do Datastax docs recommend Java 6?
Date Tue, 05 Feb 2013 15:28:43 GMT
There have been tons of threads/convos on this.

In the early days of Java 7 it was pretty unstable and there was pretty much no convincing
reason to use Java 7 over Java 6.

Now that Java 7 has stabilized and Java 6 is EOL it's a reasonable decision to use Java 7
and we do it in production with no issues to speak of.

That being said there was one potential situation we've seen as a community where bootstrapping
new node was using 3x more CPU and getting significantly less throughput. However, reproducing
this consistently never happened AFAIK.

I think until more people use Java 7 in production and prove it doesn't cause any additional
bugs/performance issues Datastax will update their docs. Until now I'd say it's a safe bet
to use Java 7 with Vanilla C* 1.2.1. I hope this helps!


From: Baron Schwartz <<>>
Reply-To: "<>" <<>>
Date: Tuesday, February 5, 2013 7:21 AM
To: "<>" <<>>
Subject: Why do Datastax docs recommend Java 6?

The Datastax docs repeatedly say (e.g.
that Java 7 is not recommended, but they don't say why. It would be helpful to know this.
Does anyone know?

The same documentation is referenced from the Cassandra wiki, for example,

- Baron

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